- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21069-12B1" - Not available
VW - Golf, Touran, Passat, Tiguan, Transporter; AUDI - A4, A5; SEAT - Exeo, Alhambra; SKODA - Fabia, Octavia